“What you’re saying is true, yes. But I’m not sure that it’s really relevant to the discussion.”

You're leading a meeting to discuss a change in your division at work. One of the managers is complaining because his group doesn't have enough people, and the company won't let him hire more. His complaints aren't helpful, so you switch the topic to something else.

What you’re saying is true, yes. But I’m not sure that it’s really relevant to the discussion.

A good technique when you're debating with someone is to agree with some parts of what they've said but disagree on other points. One way to do that is with the phrase "What you're saying is true, but...."

A: The cost of attending a university these days is outrageous. Kids these days are coming out of school hundreds of thousands of dollars in debt. It doesn't seem worth it.

B: What you're saying is true, but having a degree is still necessary for getting a lot of highly-paid professional jobs.

You can use the word "discussion" to talk about the conversation that you're having right now. But a "discussion" can also be a conversation that continues for a longer period of time.

For example, if you're trying to decide where to send your children to school, the "discussion" with your partner about where to send them might last for several months and involve several conversations.